Suppose an experimenter becomes proficient with a technique that allows her to move DNA sequences within a prokaryotic genome.
-If she moves the operator to a position upstream from the promoter, what would occur?
A) The lac operon will function normally.
B) The lac operon will be expressed continuously.
C) The repressor will not be able to bind to the operator.
D) The repressor will bind to the promoter.
E) The repressor will no longer be made.

Question

Quizplus · Accepted Answer

Moving the operator upstream from the promoter will place it closer to the RNA polymerase binding site. This will increase the likelihood of the RNA polymerase binding to the promoter and transcribing the genes in the lac operon, leading to continuous expression of the operon. The repressor will still be able to bind to the operator, but it will not have an effect on gene expression as the RNA polymerase will bypass it.

Suppose an Experimenter Becomes Proficient with a Technique That Allows